A vulnerability has been found in FreeBSD up to 11.2/11.3/12.0 (Operating System) and classified as critical. Affected by this vulnerability is some unknown functionality of the component bhyve e1000 Device Emulation. The manipulation as part of a TCP Segment leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In FreeBSD 12.0-STABLE before r350619, 12.0-RELEASE before 12.0-RELEASE-p9, 11.3-STABLE before r350619, 11.3-RELEASE before 11.3-RELEASE-p2, and 11.2-RELEASE before 11.2-RELEASE-p13, the bhyve e1000 device emulation used a guest-provided value to determine the size of the on-stack buffer without validation when TCP segmentation offload is requested for a transmitted packet. A misbehaving bhyve guest could overwrite memory in the bhyve process on the host.

The weakness was published 08/30/2019 (Website). It is possible to read the advisory at security.FreeBSD.org. This vulnerability is known as CVE-2019-5609 since 01/07/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Applying a patch is able to eliminate this problem.

Similar entries are available at 141117, 141116 and 141114.

Productinfo

Type

• Operating System

Name

• FreeBSD

Version

• 11.0
• 11.1
• 11.2
• 11.3
• 12.0

License

• open-source

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